Well... Personally I think it will come out better if everyone sings seperately, with maybe a couple of two- or three-part harmonies thrown in. (As much as I'd love four, I don't see it happening, lol.) But that's just how I would arrange it. I do think it would sound a heck of a lot better than everyone singing together. At the same time. Now THAT would be a mess!
I think this is interesting! I can't wait to hear it, no matter how "bad" it may be.